390870646 has 4 divisors (see below), whose sum is σ = 586305972. Its totient is φ = 195435322.

The previous prime is 390870643. The next prime is 390870653. The reversal of 390870646 is 646078093.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390870643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97717660 + ... + 97717663.

It is an arithmetic number, because the mean of its divisors is an integer number (146576493).

Almost surely, 2^390870646 is an apocalyptic number.

390870646 is a deficient number, since it is larger than the sum of its proper divisors (195435326).

390870646 is a wasteful number, since it uses less digits than its factorization.

390870646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195435325.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 390870646 is about 19770.4488062360. The cubic root of 390870646 is about 731.1576340734.

The spelling of 390870646 in words is "three hundred ninety million, eight hundred seventy thousand, six hundred forty-six".